The post I was replying to included links to studies, in which grey matter was assessed in people who play too many video games, don't sleep enough, etc. I was merely making the point that evidence of gray matter reduction in other studies, isn't reason alone to write off the one I linked. We should probably take them all seriously (assuming sound practices).

>What we are discussing here is you mandating that all drivers of cars gets to bed by 10PM and have a good sleep, on the chance that lack of sleep leads to bad driving which leads to higher chances of accidents, including to those who slept well last night, yet were involved in the accident

Not even close to the reality of the situation, but you wouldn't be the first to take a very hyperbolic approach to it.